<!DOCTYPE html>

  <meta charset="UTF-8">
  <title>CSS Reference Test</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">

  <style>
  div
    {
      font-size: 40px;
      line-height: 1;
    }

  /*
     https://www.w3.org/TR/css-pseudo-4/#highlight-bounds
     For text, the corresponding overlay must cover at least
     the entire em box and may extend further above/below the
     em box to the line box edges.
  */

  span
    {
      background-color: Highlight;
      color: HighlightText;
    }

  </style>

    <div><span>With system-color-highlight</span></div>

    <div><span>With getSelection()</span><br></div>
